Quote:
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Originally Posted by Adey Baker
It's dead easy to check in about 2 seconds with a zoom lens on your camera - find two subjects that are at different distances but which appear the same size as one another. Now zoom your lens one way or the other and you'll see that they are still the same size as each other. QED
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Adey
You would have to move as well to keep the magnification factor the same. Because as you zoom and remain in the same spot you are changing the magnification factor. The factor which made the 2 objects the same size has now changed and therefore they will appear different in size.
The size of a near and distance object is due to the magnification factor. In the equation for magnification focal length plays no part in it. It is ratio of the lens to film/sensor distance to the lens to subject distance.